Here is something I want to share with the community. I have done quite a bit of work on the standalone S-Meter from KD8CEC.  The functionality Dr. Lee has provided in his firmware is fabulous, and this is my contribution to the effort.  I did this using a V4 board, but I think these changes are version independent - just requires use of KD8CEC firmware.

The Summary is below, full details are in the ReadMe on GitHub at https://github.com/soligen2010/dspmeterv1.  The new version is under i2cmeter2

This started with 2 simple goals in mind, but snowballed into a pretty large revamp and more improvements that I originally intended.  The original intent was:

• Get the CW decode to function (it was not working for me)
• Memory was very constrained - reduce memory usage so future new functionality can be added.

Here are some highlights. See the ReadMe on GitHub for the details.

• CW decode mods - hard to tell degree of improvement, but it now works for me if the signal is not too weak.
• Significant reduction in memory usage
• More accurate frequency display on FFT (Requires a Nextion UI tweak)
• Faster, higher resolution S-Meter (higher resolution Requires a Nextion UI tweak, High resolution is optional)
• Calibratable S-Meter (and circuit for optional signal boost)
• Calibratable Power/SWR Meter
• Fixed several potential stability issues.  I never experienced instability - I corrected things I noticed that might have one day caused an issue.
• Significant code streamlining and reorganization.
• Optional faster Serial speed (requires tweak to Nextion and Ubitx firmware)
• Improved frequency change latency when the FFT is being displayed
• Optional support for using the Hardware serial output port instead of Software serial.

I also included my customized Nextion firmware (3.2" display)

• Tweaks to go with the changes above.
• Added Power and SWR meter screen (graphical)
• Added Power and SWR (numeric) to main screen when transmitting - SWR flashes yellow/red when too high
• Streamlined MEM to VFO screen
  • Frequencies are loaded when the screen opens
  • Selecting a frequency immediately returns to main screen
• I think there may be other tweaks I did some time ago - I don't recall the specifics.

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Dennis WC8C

Dennis,

Thanks Dennis,
this looks really interesting, I think I’ll give it a try.
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73
Mick VA3EPM 

Would love to have this for a Nextion 3.5

Give it a try.  It should work fine on 3.5.  It just won't use the whole screen.
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Dennis WC8C